Question

Which of the following statements is correct?

• A. The elements having large negative values of electron gain enthalpy generally act as strong oxidising agents
• B. The elements having low values of ionisation enthalpy act as strong reducing agents
• C. The formation of $S^{2-}\left(g\right)$ from $S\left(g\right)$ is an endothermic process
• D. All of these

Answer 1

The correct option is D All of these

(a) The elements having large negative values of electron gain enthalpy generally act as strong oxidising agents because they have a high tendency of accepting electrons.

(b) The elements having low value of ionisation enthalpy act as strong reducing agents because they have a high tendency of losing electrons.

(c) The formation of $S^{2-}\left(g\right)$ from $S\left(g\right)$ is an endothermic process. The incoming electron will experience inter-electronic repulsions because of which the electron gain enthalpy becomes positive.
$({\Delta }_{eg}{H}_1=\text{small negative value},{\Delta }_{eg}{H}_2=\text{large positive value})$